<!DOCTYPE html>

<html>
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title></title>
        <meta name="description" content="">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link rel="stylesheet" href="">
    </head>
    <body>
      
        <script>
 let {toString:s}=123;
 console.log(s===Number.prototype.toString);

 let{toString:b}=true;
 console.log(b===Boolean.prototype.toString)
        </script>
    </body>
</html>